I have an EAR 834P that has developed distortion on the left channel. It only occurs on certain relatively high frequency sounds. I've replaced the tubes but that didn't help.
Anyone able (and willing) to help me fix it? If anyone had a schematic they'd be willing to share, that would be a good start.
Based on my experiences (not with EAR, but with commercial audio components in general), I'm not very enthused about sending it to a dealer for repair. If I cannot fix it, I'll probably build a solid state phono preamp (maybe the PhonoClone).
Thanks!
Anyone able (and willing) to help me fix it? If anyone had a schematic they'd be willing to share, that would be a good start.
Based on my experiences (not with EAR, but with commercial audio components in general), I'm not very enthused about sending it to a dealer for repair. If I cannot fix it, I'll probably build a solid state phono preamp (maybe the PhonoClone).
Thanks!
Originally posted by Paul Ebert
If I cannot fix it, I'll probably build a solid state phono preamp.
Egad man....that's heresy!
The EAR834P schematic can be found here:
http://bbs.hifidiy.net/viewthread.php?tid=92192&extra=page=1&filter=type&typeid=10&page=2
and here:
http://www.audiocircle.com/gallery/displayimage.php?album=546&pos=0
Enjoy,
-- josé k.
http://bbs.hifidiy.net/viewthread.php?tid=92192&extra=page=1&filter=type&typeid=10&page=2
and here:
http://www.audiocircle.com/gallery/displayimage.php?album=546&pos=0
Enjoy,
-- josé k.
It's generally a bad idea to start modifying something that isn't working. Fix the problem first, then you can start spending money on random fashion componentry.
I'd start by measuring the plate and cathode voltages of each stage and indicating them on the schematic. Compare them between channels.
I'd start by measuring the plate and cathode voltages of each stage and indicating them on the schematic. Compare them between channels.
Could be. But the description sounded like an overload situation which could be due to an operating point shift:
It only occurs on certain relatively high frequency sounds.
A broken wire or bad solder joint between the jacks and the board maybe? Does yours have the built in SUTs? Maybe the MM MC switch is dirty.
Every tube is shared between both channels. It's not unknown for the two haves to age differently but not likely that only one side would go real bad.
Remove and reinstall all of the tubes 3 or 4 times. Might be a dirty connection between tubes pins and socket.
Steve
Every tube is shared between both channels. It's not unknown for the two haves to age differently but not likely that only one side would go real bad.
Remove and reinstall all of the tubes 3 or 4 times. Might be a dirty connection between tubes pins and socket.
Steve
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